The upgrade is available over-the-air for HSPA+ Galaxy Nexus models. Owners of the device will be prompted to update over the next few days, but in order to speed up the process they can access the new OS by checking for software updates.

JellyBean debuted at Google I/O at the end of last month. The OS brings many new features to the Android platform, including a revamped notifications system, and the Siri competitor known as Google Now.

The software also features a redesigned search experience with a new user interface and faster Voice Search.

Google Now has the ability to answer voice commands and answer commonly asked questions such as what the weather will be, or how much traffic to expect, or even the score of a sports game.

The next devices expected to receive the software update include the rest of the Galaxy Nexus models, the Nexus S, and Motorola XOOM tablet. Those should upgrade in the coming weeks.

Android 4.1, JellyBean will also come pre-installed on the upcoming Google Nexus 7 tablet that the company also unveiled at its I/O event.

Various tech publications such as 9to5 Google and had the opportunity to spend some time with the device and did not have too many bad things to say about it. In fact, the site believes strongly in its potential.

"Make no mistake; Nexus 7 is a game changer. Google has hit it out of the park this time," said the site in its review of the tablet. "I have no doubt that Google's first Nexus Tablet will be the best-selling 7-inch tablet this summer and might actually give the iPad a run for its money if marketed well and in enough places."